Two Element Drum Level Control System
A two-element drum level control system is capable of providing close adherence of drum level to its set-point under steady-state conditions as well as being capable of providing the required…
Three Element Drum Level Control System
In most drum level control applications, the two-element drum level control will maintain the required water/steam interface level – even under moderate load changes. However, If an unstable feedwater system…
Control Room and Field Instruments Questions and Answers
Instrument Engineers Interview Questions, Control Room Interview Questions, Field Instruments Questions and Answers, Instrumentation Questions & Answers.
Overview of Tank Gauging Technologies
Two types of measurement methods are used for tank gauging: volume or mass based. In a volume based system, level is measured. In a mass based system, the measurement of…
Servo Tank Gauges Working Principle
Tank gauging is the generic name given to the measurement of liquids (product) in bulk storage tanks with the aim of quantifying how much product is in the tank, "gauging…
Serial Communication Data Transmission Modes
Serial Communication Data Transmission Modes means transferring of data between two devices. It is also called communication mode. These modes direct the direction of flow of information. There are three…
Ultrasonic Flow Meters Working Principle
Ultrasonic flow meters operate using difference in time travelled by the two ultrasonic waves is directly proportional to the flow velocity.
Electronics Questions & Answers
1. What is Electronic? The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. 2. What is communication? Communication means…
Cascade Control Principle
What is Cascade Control? In single-loop control, the controller’s set point is set by an operator, and its output drives a final control element. For example: a level controller driving…
Difference Between RS232 and RS485
RS232 vs RS485 RS232 and RS485 are standards for data cables. To exchange data between nodes on a network, the most commonly used tools are line drivers and receivers. It is…
